Various updates to ROMS plotting package

[arango]

The ROMS plotting package was updated to include:

• Better management of variables with time records. Specially, when the units attribute is, for example, of the form:

        ocean_time:units = "seconds since 1900-01-01 00:00:00"
  or
        ocean_time:units = "days since 1968-05-23 12:00:00"
  

• Added new integer function datenum to calculate the number of days since 01-Jan-0000. This is similar to the Matlab intrinsic function datenum:

        mydate=datenum(day, month, year)
  

• Added new subroutine datevec to compute the year, month, day, hour, minute, and second associated with a double precision date number. This is the reverse to datenum and similar to the Matlab intrinsic function datevec:

        CALL datevec (datenum, year, month, iday, hour, minute, second)
  

• Added new subroutine dateref to decode the time units attribute discussed above:

        CALL dateref (time_att, time_red, julday)
  

• Added new integer function yearday to compute the day of the year number:

        yday=yearday(year, month, day)
  

• The internal time variables in the plotting package (time1 and time2) are now double precision to allow the processing of very large numbers in the input time data.

• Updated the makefile so we can use new build scripts Bin/build_plt.sh or Bin/build_plt.bash. As in ROMS build scrits, the plotting package can be compiled from anywhere and the compilation files are now stored in the specified Build_plt scratch directory.

• All the configuration files were updated to facilitate the compilation with the NetCDF-4 nc-config script. By the way, the plotting package can plot ROMS NetCDF files from an OpenDAP sever. The users need to compile the ROMS plotting package with the NetCDF-4/HDF-5 serial libraries. Note that the plotting package is not supported for parallel computations. Currently, everything is executed in a single CPU (serial run).

• The ncgm2gif script is renamed to ncgm2gif.sh.

• Added new script ncgm2cgm.sh to convert NCAR's NCGM file (single or multi frame) to vanila CGM (*.cgm) file(s):

        ncgm2cgm.sh gmeta ssh
  

• Added new script ncgm2png.sh to convert NCAR's NCGM file (single or multi frame) to PNG (*.png) file(s):

        ncgm2png.sh -fmt vec -res 300dpi gmeta